# Relationship history for MSHA mine 3002623

Current hierarchy: **Emil J  Galasso → Allied Materials Corp → Helms Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Allied Materials Corp → Helms Quarry; 1981-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Emil J  Galasso et al → Helms Quarry; 1981-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Emil J  Galasso et al → Allied Materials Corp; 1981-08-01 to current/open; source msha-controller-operator-history